/**
 * @file
 * Management Information Base II (RFC1213) SNMP objects and functions.
 */

/*
 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * Author: Dirk Ziegelmeier <dziegel@gmx.de>
 *         Christiaan Simons <christiaan.simons@axon.tv>
 */

#include "lwip/snmp.h"
#include "lwip/apps/snmp.h"
#include "lwip/apps/snmp_core.h"
#include "lwip/apps/snmp_mib2.h"
#include "lwip/apps/snmp_scalar.h"

#if LWIP_SNMP && SNMP_LWIP_MIB2

#define MIB2_AUTH_TRAPS_ENABLED  1
#define MIB2_AUTH_TRAPS_DISABLED 2

/* --- snmp .1.3.6.1.2.1.11 ----------------------------------------------------- */
static s16_t snmp_get_value(const struct snmp_scalar_array_node_def *node, void *value)
{
    u32_t *uint_ptr = (u32_t *)value;

    switch (node->oid) {
        case 1: /* snmpInPkts */
            *uint_ptr = snmp_stats.inpkts;
            break;

        case 2: /* snmpOutPkts */
            *uint_ptr = snmp_stats.outpkts;
            break;

        case 3: /* snmpInBadVersions */
            *uint_ptr = snmp_stats.inbadversions;
            break;

        case 4: /* snmpInBadCommunityNames */
            *uint_ptr = snmp_stats.inbadcommunitynames;
            break;

        case 5: /* snmpInBadCommunityUses */
            *uint_ptr = snmp_stats.inbadcommunityuses;
            break;

        case 6: /* snmpInASNParseErrs */
            *uint_ptr = snmp_stats.inasnparseerrs;
            break;

        case 8: /* snmpInTooBigs */
            *uint_ptr = snmp_stats.intoobigs;
            break;

        case 9: /* snmpInNoSuchNames */
            *uint_ptr = snmp_stats.innosuchnames;
            break;

        case 10: /* snmpInBadValues */
            *uint_ptr = snmp_stats.inbadvalues;
            break;

        case 11: /* snmpInReadOnlys */
            *uint_ptr = snmp_stats.inreadonlys;
            break;

        case 12: /* snmpInGenErrs */
            *uint_ptr = snmp_stats.ingenerrs;
            break;

        case 13: /* snmpInTotalReqVars */
            *uint_ptr = snmp_stats.intotalreqvars;
            break;

        case 14: /* snmpInTotalSetVars */
            *uint_ptr = snmp_stats.intotalsetvars;
            break;

        case 15: /* snmpInGetRequests */
            *uint_ptr = snmp_stats.ingetrequests;
            break;

        case 16: /* snmpInGetNexts */
            *uint_ptr = snmp_stats.ingetnexts;
            break;

        case 17: /* snmpInSetRequests */
            *uint_ptr = snmp_stats.insetrequests;
            break;

        case 18: /* snmpInGetResponses */
            *uint_ptr = snmp_stats.ingetresponses;
            break;

        case 19: /* snmpInTraps */
            *uint_ptr = snmp_stats.intraps;
            break;

        case 20: /* snmpOutTooBigs */
            *uint_ptr = snmp_stats.outtoobigs;
            break;

        case 21: /* snmpOutNoSuchNames */
            *uint_ptr = snmp_stats.outnosuchnames;
            break;

        case 22: /* snmpOutBadValues */
            *uint_ptr = snmp_stats.outbadvalues;
            break;

        case 24: /* snmpOutGenErrs */
            *uint_ptr = snmp_stats.outgenerrs;
            break;

        case 25: /* snmpOutGetRequests */
            *uint_ptr = snmp_stats.outgetrequests;
            break;

        case 26: /* snmpOutGetNexts */
            *uint_ptr = snmp_stats.outgetnexts;
            break;

        case 27: /* snmpOutSetRequests */
            *uint_ptr = snmp_stats.outsetrequests;
            break;

        case 28: /* snmpOutGetResponses */
            *uint_ptr = snmp_stats.outgetresponses;
            break;

        case 29: /* snmpOutTraps */
            *uint_ptr = snmp_stats.outtraps;
            break;

        case 30: /* snmpEnableAuthenTraps */
            if (snmp_get_auth_traps_enabled() == SNMP_AUTH_TRAPS_DISABLED) {
                *uint_ptr = MIB2_AUTH_TRAPS_DISABLED;
            } else {
                *uint_ptr = MIB2_AUTH_TRAPS_ENABLED;
            }

            break;

        case 31:           /* snmpSilentDrops */
            *uint_ptr = 0; /* not supported */
            break;

        case 32:           /* snmpProxyDrops */
            *uint_ptr = 0; /* not supported */
            break;

        default:
            LWIP_DEBUGF(SNMP_MIB_DEBUG, ("snmp_get_value(): unknown id: %" S32_F "\n", node->oid));
            return 0;
    }

    return sizeof(*uint_ptr);
}

static snmp_err_t snmp_set_test(const struct snmp_scalar_array_node_def *node, u16_t len, void *value)
{
    snmp_err_t ret = SNMP_ERR_WRONGVALUE;
    LWIP_UNUSED_ARG(len);

    if (node->oid == 30) {
        /* snmpEnableAuthenTraps */
        s32_t *sint_ptr = (s32_t *)value;

        /* we should have writable non-volatile mem here */
        if ((*sint_ptr == MIB2_AUTH_TRAPS_DISABLED) || (*sint_ptr == MIB2_AUTH_TRAPS_ENABLED)) {
            ret = SNMP_ERR_NOERROR;
        }
    }

    return ret;
}

static snmp_err_t snmp_set_value(const struct snmp_scalar_array_node_def *node, u16_t len, void *value)
{
    LWIP_UNUSED_ARG(len);

    if (node->oid == 30) {
        /* snmpEnableAuthenTraps */
        s32_t *sint_ptr = (s32_t *)value;

        if (*sint_ptr == MIB2_AUTH_TRAPS_DISABLED) {
            snmp_set_auth_traps_enabled(SNMP_AUTH_TRAPS_DISABLED);
        } else {
            snmp_set_auth_traps_enabled(SNMP_AUTH_TRAPS_ENABLED);
        }
    }

    return SNMP_ERR_NOERROR;
}

/* the following nodes access variables in SNMP stack (snmp_stats) from SNMP worker thread -> OK, no sync needed */
static const struct snmp_scalar_array_node_def snmp_nodes[] = {
    { 1, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },   /* snmpInPkts */
    { 2, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },   /* snmpOutPkts */
    { 3, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },   /* snmpInBadVersions */
    { 4, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },   /* snmpInBadCommunityNames */
    { 5, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },   /* snmpInBadCommunityUses */
    { 6, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },   /* snmpInASNParseErrs */
    { 8, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },   /* snmpInTooBigs */
    { 9, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },   /* snmpInNoSuchNames */
    { 10, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpInBadValues */
    { 11, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpInReadOnlys */
    { 12, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpInGenErrs */
    { 13, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpInTotalReqVars */
    { 14, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpInTotalSetVars */
    { 15, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpInGetRequests */
    { 16, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpInGetNexts */
    { 17, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpInSetRequests */
    { 18, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpInGetResponses */
    { 19, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpInTraps */
    { 20, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpOutTooBigs */
    { 21, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpOutNoSuchNames */
    { 22, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpOutBadValues */
    { 24, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpOutGenErrs */
    { 25, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpOutGetRequests */
    { 26, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpOutGetNexts */
    { 27, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpOutSetRequests */
    { 28, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpOutGetResponses */
    { 29, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpOutTraps */
    { 30, SNMP_ASN1_TYPE_INTEGER, SNMP_NODE_INSTANCE_READ_WRITE }, /* snmpEnableAuthenTraps */
    { 31, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY },  /* snmpSilentDrops */
    { 32, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY }   /* snmpProxyDrops */
};

const struct snmp_scalar_array_node snmp_mib2_snmp_root = SNMP_SCALAR_CREATE_ARRAY_NODE(11, snmp_nodes, snmp_get_value, snmp_set_test, snmp_set_value);

#endif /* LWIP_SNMP && SNMP_LWIP_MIB2 */
